Small gauge differences can identify a stamp, but scans and damaged edges can mislead.
The practical lesson
- Measure both directions.
- Use a real gauge.
- Check for reperforation.
What to do next
Photograph the object, preserve its context, convert the description into measurable traits, and compare only genuinely similar items.
Compare current collector listings
Use listings to study descriptions, scans, certificates, and market supply. Asking prices are not completed-sale evidence.
Compare collector listings